USA As Represented by Secretary of the Navy

Joseph A Zenel

William E Barnette

William G McGuffin

A distributed loop antenna is embodied in a flexible cable structure for marine E.L.F. (extremely low frequency) radio reception. Several distributed loop and magnetic core configurations which provide 'side-looking' reception are described, as is the ability of flexible distributed loops to minimize the induction of noise voltages in the antenna.

Antenna cable

A counterwound, magnetic core for a towed-cable, helically wound, ELF anta comprising a cylindrical, plastic, center insert, with or without a center conductor, with two strips or sets of strips of magnetic material counterwound about it so that a plurality of good-mechanical-contact, strip, crossover points are formed distributed around the circumference of the insert and down its length. An insulating material is then wrapped around these counterwound strips and a conductor helically wound around that. This design, by providing alternate flux paths down the core via the crossover points provides a lower, core reluctance and, when the core is under stress, provides a flux path that avoids the high-stress regions of the core thus reducing the amount of flux that is stress-modulated. Thus a substantial magnetostrictive noise reduction is obtained.

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Princeton, NJ, United States of America

Joseph A Zenel